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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | 17x 17x 40x 40x 40x 589x 589x 589x 123x 123x 123x 123x | import prand from 'pure-rand'
export default class RNG {
private generator: prand.RandomGenerator
public seed: number
constructor(seed?: number) {
this.seed = seed ?? Date.now() ^ (Math.random() * 0x100000000)
this.generator = prand.xoroshiro128plus(seed)
}
/**
* Returns a uniformly distributed random integer between min and max
*/
public uniformInt(min: number, max: number): number {
const [value, rng] = prand.uniformIntDistribution(min, max)(this.generator)
this.generator = rng
return value
}
/*
* Returns a uniformly distributed random float between min and max
*/
public uniformFloat(min: number, max: number) {
const [value, rng] = prand.uniformIntDistribution(min * 1000, max * 1000)(this.generator)
this.generator = rng
return value / 1000
}
/**
* Returns a normally distributed random number with mean mu and standard deviation sigma.
*/
public normalFloat(mu: number, sigma: number): number {
let u = 0, v = 0
while (u === 0) u = 1 - this.uniformFloat(0, 1)
while (v === 0) v = this.uniformFloat(0, 1)
return sigma * Math.sqrt(-2.0 * Math.log(u)) * Math.cos(2.0 * Math.PI * v) + mu
}
}
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